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Finding the Fourth Proportional to 392.60, 589.10 and 285.27

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Solution

The fourth proportional to 392.60, 589.10 and 285.27 is: 428.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.60 : 589.10 = 285.27 : x
  2. Step 2: Convert to fraction form
    392.60/589.10 = 285.27/x
  3. Step 3: Cross multiply
    392.60x = 589.10 × 285.27
  4. Step 4: Simplify right side
    392.60x = 168,051.13
  5. Step 5: Solve for x
    x = 168,051.13/392.60
  6. Step 6: Final answer
    x = 428.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.